Frederick k



(No Model.)

F. K. PITCH.

ELECTRIC ARC LAMP.

No. 264,267. Patented Sept. 12, 1882.

WITNESSES: 3 j (j g Z [AWE/V7012 A TTORNEKS.

UNiTEn S'rnrns FREDERICK K. FITCH,

PATENT OF NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 264,267, dated September 12, 1882.

Application filed May 8, 1882. (No model.)

To all whom it may concern:

Be it known that I, Fnnnnnrox K. Frrou, of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Arc Lamps, and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, which form a part of this specification, in which- Figure lis afront viewof myimproved lamp, the globe being in section. Fig. 2 is a side View, partly sectional, of my regulating and feeding devices.

The object of this invention is to simplify as much as possible the construction of arc-lamps in so far as relates to the mechanism by which the arc is established, the carbon fed in proportion to consumption, and the circuit closed upon momentary failure of the current to surmount the distance between the electrodes.

To these ends my invention consists in the construction and combination of parts substantiall y ashereinafter fully described and claimed.

In the drawings, A a a B represent respectively the top plate, side rods, and base-plate of the lamp, between which is suitably secured the glass globe (J, in which the are is to be established and maintained between the elec trodes b c. Thelower carbon is suitably clamped in a holder, (1, of any desired form, attached to the base-plate B.

A coarse helix, D, is secured on top of the top plate, A, at one side of the center, and is provided witha fixed core of soft iron. (Represented by dotted lines.) To each end of this core are firmly attached the polar extensions N and S, which project across the axis of movement desired for the carbon-holder f, and are perforated to receive and guide the latter. By this means the rod f may be very accurately centered and guided, as no play is needed at these extensions N and S. The outer ends of extensions N and S or poles are firmly held by the non-magnetic bar or support g, to whose center is swiveled or pivoted an S-shaped armature, H, normally hangingin such position that it does not close the magnetic field between the poles N and S. NVhen current energizes the poles N and S they attract the respective ends of the armature II, which thus oscillates on its center pin, h, and moves .in a vertical plane. An arm or link, i, pivoted to the armature H, projects upwardly, and is pivoted to one end of a clamp, 7t,which is adapted to grip the carbon-holding rod f when tilted or raised at that end, the rod f passing through it. To the other end of the clamp 70, I attach a spring, 8, which is adjustably attached to a swivel, m, pivoted on the armature H, as shown. The link a is on one side of the carbon-holding rod f, and the swivel m and spring 8 are on the other side. The currententers at theinsulated post P,\vhence it goes to and through helix D, thence to red f via plate A, thence to carbon 1), to carbon 0, to plate 13, to post 1?, and to line. Rod a is insulated from plates Aand 13. When the helix D is energized by the current the poles N S attract the respective ends of the S- shaped armature H, which, oscillating on its center, raises the arm 6 and tilts the clamp k. The spring 8 on the opposite side being drawn down by the oscillation of the armature H, the rodfis clamped firmly and at the same time raised upwardly through the guide-holes in poles N and S. Carbon 1) is raised with it and the are established. When in the course of time the arc would tend to become too long by consumption of the carbons the increase in re" sistance of the arc would have a tendency to weaken the current, thus reduein g the attractive power of the poles N and S. In that event the armature H, by gravity or by the force of a suitable retracting-spring, oscillates backwardly and allows rod f to be lowered by the clamp is. This action takes place at once and the are is diminished to a degree suitable to the strength of the current. Then there is no current traversing the lamp-helix and electrodes the clamp is inoperative to sustain or lift the rodf, and consequently the latter drops into position where the carbons I) c are in contact, thus automatically re-establishin g the circuit at that point. The amount of movement required for this purpose will be the length of the maximum are. To prevent any damage from sudden fall of the rod f and carbon 1) through this distance, the clamp k is so adjusted as to not assume a horizontal position till the rodfhas descended about this disatnee, and until the clamp is horizontal, or at right angles to red f, its grip on the rod remains effective.

At this point I place a projecting pin, 15, on the bar g, adj nstable, it desired,which will stop the downward oscillation of the clamp 70 at a point just before contact of the two carbons takes 5 place, or thereabont, so that when about horizontal the clamp 7c lets go of the rod f, the latter slides down, the resistance diminishes, the magnetism of N and S increases, and the clam p is again oscillated and the are adjusted. These 10 changes take place in a minute degree and are hardly appreciable.

I claim as my invention- 1. In an arc-lamp, the combination,with the carbon-holding rod f, of an electro-magnet, D, whose axis is at one side of and parallel to red f, and provided with polar extensions N and S, perforated for the passage of the rod f, and an S-shaped armature, H, suitably swiveled and provided with a clamp, 70, substantially as described.

2. The combination of magnet D, extensions N and S, bar 9, S-shaped armature H, pivoted thereto, link z, clamp k, spring 8, and swivel m, substantially as described.

3; In an electric-arc lamp, in combination with the carbon-holding rod f, a clamp extending on both sides thereof, and attached on one side to an oscillating armature directly and on the other side attached to said armature by an interposed spring, substantially as described, whereby the one side of the clamp is tilted upwardly by the armature directly and the other side depressed by the spring and the lift of the rod effected by the preponderance of power in the direct upward tilting. 3 5

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

FREDERICK K. FITCH.

Witnesses:

WM. APGAR, J AS. H. MATTHAW. 

